Try it on an Ipod though Marks, the problem is the isopropyl disolves in water and evaporates very fast, but the water doesn't. It sneaks underneath the leads of surface mount chips and once the alcohol is gone the surface tension keeps it from getting out. You need a pure non-corrosize solvent. You might be able to freeze distill the Iso-propyl but I'm not sure. All in all AGAIN this is WAY more effort than possible benefit... If you're really hard up, use the 70% isopropyl, but don't be surprised if it works for a while and corrodes again later, oxides tend to be auto-catalytic, if any is left more will form.